CN116698220A - Battery temperature acquisition circuit, product and battery temperature acquisition method - Google Patents

Battery temperature acquisition circuit, product and battery temperature acquisition method Download PDF

Info

Publication number
CN116698220A
CN116698220A CN202310975032.2A CN202310975032A CN116698220A CN 116698220 A CN116698220 A CN 116698220A CN 202310975032 A CN202310975032 A CN 202310975032A CN 116698220 A CN116698220 A CN 116698220A
Authority
CN
China
Prior art keywords
temperature acquisition
module
voltage
temperature
battery
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202310975032.2A
Other languages
Chinese (zh)
Other versions
CN116698220B (en
Inventor
米胜荣
王史伟
鲁振辉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xinqi Co ltd
Original Assignee
Xinqi Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xinqi Co ltd filed Critical Xinqi Co ltd
Priority to CN202310975032.2A priority Critical patent/CN116698220B/en
Publication of CN116698220A publication Critical patent/CN116698220A/en
Application granted granted Critical
Publication of CN116698220B publication Critical patent/CN116698220B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
    • G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
    • G01K7/24—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor in a specially-adapted circuit, e.g. bridge circuit
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/385—Arrangements for measuring battery or accumulator variables
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
    • G05B19/0423—Input/output
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • B60L2240/545—Temperature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Sustainable Energy (AREA)
  • Sustainable Development (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Nonlinear Science (AREA)
  • Automation & Control Theory (AREA)
  • Secondary Cells (AREA)

Abstract

The application relates to the technical field of battery management, in particular to a battery temperature acquisition circuit, a product and a battery temperature acquisition method, wherein the battery temperature acquisition circuit comprises: the temperature acquisition module comprises a plurality of temperature acquisition units, a voltage reference module and a single chip microcomputer module, wherein the voltage reference module is respectively connected with the temperature acquisition module and the single chip microcomputer module, the temperature acquisition units are connected with the single chip microcomputer module in parallel, and each temperature acquisition unit is connected with a plurality of NTC temperature sensors inside the battery pack through a wire harness. The application can collect the temperature values of a plurality of batteries at the same time and send the temperature values of the batteries to the singlechip module at the same time, thereby improving the collection efficiency and reducing the resource occupation of the singlechip module.

Description

Battery temperature acquisition circuit, product and battery temperature acquisition method
Technical Field
The application relates to the technical field of battery management, in particular to a battery temperature acquisition circuit, a battery temperature acquisition product and a battery temperature acquisition method.
Background
At present, in order to ensure safe and stable operation of the electric car, temperature information of a single battery on the electric car needs to be accurately monitored. When the battery outputs electric power, the battery core can generate a large amount of heat, if the heat is continuously gathered, safety accidents such as short circuit, sudden loss of power, spontaneous combustion and the like of vehicle equipment can be caused, and when the battery works at a low temperature, the charging and discharging performance can be seriously influenced. Therefore, the battery must be thermally managed, and a good thermal management is required to accurately acquire the temperature of the single battery. However, no special temperature acquisition channel exists in the power management chip in the current market, the analog quantity is basically acquired through the auxiliary GPIO so as to acquire the temperature, the number of GPIO ports of the battery management chip is very limited, the functions of pressure sensing, fan feedback and the like are required to be completed besides the function of temperature acquisition, and the acquisition of too many temperature channels cannot be satisfied at all.
In summary, the prior art has the technical problem that the collection of too many temperature channels cannot be satisfied.
Disclosure of Invention
Based on the above, it is necessary to provide a battery temperature acquisition circuit, a product, and a battery temperature acquisition method in view of the above-described technical problems.
In a first aspect, a battery temperature acquisition circuit is provided, the battery temperature acquisition circuit comprising: the system comprises a temperature acquisition module, a voltage reference module and a singlechip module; the temperature acquisition module comprises a plurality of temperature acquisition units;
the voltage reference module is respectively connected with the temperature acquisition module and the singlechip module; the temperature acquisition units are connected with the singlechip module in parallel; each temperature acquisition unit is connected with a plurality of NTC temperature sensors inside the battery pack through a wire harness.
In one embodiment, the temperature acquisition unit includes: a signal multiplexer and a plurality of pull-up voltage dividing resistors; wherein the signal multiplexer comprises 4 digital signal ports and 1 analog signal output port;
each NTC temperature sensor is connected with a corresponding pull-up voltage dividing resistor in series for dividing voltage, and is electrically connected with the signal multiplexer after dividing voltage;
the 4 digital signal ports of the signal multiplexer are connected with the singlechip module in parallel; and 1 analog signal output ports of the signal multiplexer are independently and electrically connected with the singlechip module.
In one embodiment, the temperature acquisition unit includes: a first voltage follower; the first voltage follower is connected with the signal multiplexer.
In one embodiment, each temperature acquisition unit is connected with 8 NTC temperature sensors, and the temperature acquisition units acquire the temperature values of the NTC temperature sensors in a time sharing manner through the signal multiplexer.
In one embodiment, the singlechip module controls the working state of the signal multiplexer according to the 4 digital signal ports.
In one embodiment, the voltage reference module comprises a current limiting resistor, a voltage reference chip and a second voltage follower; and an externally introduced 5V power supply is connected in series with the voltage reference chip through the current limiting resistor, and the rear stage of the voltage reference chip is connected with the second voltage follower so as to output a 4.096V power supply to supply power to other circuits.
In one embodiment, the 4.096V power supply is used as a voltage dividing power supply and connected with one ends of a plurality of pull-up voltage dividing resistors, the other end of each pull-up voltage dividing resistor is respectively connected with an NTC temperature sensor, and each NTC temperature sensor corresponds to one acquisition channel; the method comprises the steps that voltage values obtained by voltage division of a pull-up voltage dividing resistor and an NTC temperature sensor are led into 8 input pins of a signal multiplexer, the signal multiplexer is controlled by a single chip microcomputer module to alternately gate a plurality of acquisition channels according to a preset switching period, the acquired temperature values are input into a first voltage follower through the signal multiplexer, and the acquired temperature values are input into the single chip microcomputer module after being isolated by the first voltage follower.
In one embodiment, the battery temperature acquisition circuit includes an NTC temperature sensor.
In a second aspect, a battery temperature acquisition product is provided, the product comprising a battery temperature acquisition circuit as described in any one of the embodiments above.
In a third aspect, a battery temperature collection method is provided, the method is applicable to a battery temperature collection circuit, and the battery temperature collection circuit comprises: the system comprises a temperature acquisition module, a voltage reference module and a singlechip module; the temperature acquisition module comprises a plurality of temperature acquisition units; the temperature acquisition unit includes: a signal multiplexer and a plurality of pull-up voltage dividing resistors;
the voltage reference module is respectively connected with the temperature acquisition module and the singlechip module; the temperature acquisition units are connected with the singlechip module in parallel; each temperature acquisition unit is connected with a plurality of NTC temperature sensors in the battery pack through a wire harness; one end of each pull-up voltage dividing resistor is connected with an NTC temperature sensor respectively, and each NTC temperature sensor corresponds to one acquisition channel;
the method comprises the following steps:
introducing the voltage value obtained by dividing the voltage by the pull-up dividing resistor and the NTC temperature sensor into a signal multiplexer;
and controlling the signal multiplexer to alternately gate a plurality of acquisition channels through the singlechip module in a preset switching period, and inputting the acquired temperature value into the singlechip module through the signal multiplexer.
The battery temperature acquisition circuit, the product and the battery temperature acquisition method, wherein the battery temperature acquisition circuit comprises: the temperature acquisition module comprises a plurality of temperature acquisition units, a voltage reference module and a single chip microcomputer module, wherein the voltage reference module is respectively connected with the temperature acquisition module and the single chip microcomputer module, the temperature acquisition units are connected with the single chip microcomputer module in parallel, and each temperature acquisition unit is connected with a plurality of NTC temperature sensors inside the battery pack through a wire harness. The temperature acquisition units are connected with the singlechip module in parallel, so that the temperature values of a plurality of batteries can be acquired simultaneously, the problems of insufficient number of channels and difficult expansion are solved, the temperature acquisition of the batteries in multiple channels is realized without being limited by the number of GPIO ports of the management chip, and the temperature values of the batteries are transmitted to the singlechip module, thereby improving the acquisition efficiency and reducing the resource occupation of the singlechip module.
Drawings
FIG. 1 is a block diagram of a battery temperature acquisition circuit in one embodiment;
FIG. 2 is a block diagram of a temperature acquisition unit in one embodiment;
FIG. 3 is a block diagram of a temperature acquisition unit in another embodiment;
FIG. 4 is a schematic diagram of single channel cell temperature acquisition in one embodiment;
FIG. 5 is a block diagram of voltage reference module 20 in one embodiment;
FIG. 6 is a flow chart of a method of battery temperature acquisition in one embodiment;
fig. 7 is an internal structural diagram of a computer device in one embodiment.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
In one embodiment, as shown in fig. 1, there is provided a battery temperature acquisition circuit including: the device comprises a temperature acquisition module 10, a voltage reference module 20 and a singlechip module 30; the temperature acquisition module 10 comprises a plurality of temperature acquisition units 101;
the voltage reference module 20 is respectively connected with the temperature acquisition module 10 and the singlechip module 30; a plurality of temperature acquisition units 101 are connected with the singlechip module 30 in parallel; each temperature acquisition unit 101 is connected to a plurality of NTC temperature sensors 40 inside the battery pack through a wire harness.
The battery temperature acquisition circuit can also be called as a drive motor controller overcurrent protection circuit. The battery temperature acquisition circuit includes: the device comprises a temperature acquisition module 10, a voltage reference module 20 and a singlechip module 30. The single-chip microcomputer module 30 may be a micro control unit (Microcontroller Unit, MCU).
The temperature acquisition module 10 includes a plurality of temperature acquisition units 101, for example, 4 temperature acquisition units 101 may be included in each temperature acquisition module 10.
The voltage reference module 20 is respectively connected with the temperature acquisition module 10 and the singlechip module 30. A plurality of temperature acquisition units 101 are connected in parallel with the single chip microcomputer module 30. Each temperature acquisition unit 101 is connected to a plurality of NTC temperature sensors 40 inside the battery pack through a wire harness. Each NTC temperature sensor 40 inside the battery pack is in contact with each cell post, i.e., 1 NTC temperature sensor 40 is placed on 1 cell.
In the embodiment of the application, the plurality of temperature acquisition units 101 are connected in parallel with the singlechip module 30, so that the temperature values of a plurality of batteries can be acquired simultaneously, the multi-channel battery temperature acquisition is realized without being limited by the number of GPIO ports of a management chip, and the temperature values of the plurality of batteries are transmitted to the singlechip module 30 simultaneously, thereby improving the acquisition efficiency and reducing the resource occupation of the singlechip module.
In an alternative embodiment, the battery temperature acquisition circuit further comprises an NTC temperature sensor 40 inside the battery pack.
In an alternative embodiment, the battery temperature acquisition circuit further includes a wire harness, and the temperature acquisition unit 101 is connected to the NTC temperature sensor 40 through the wire harness.
In an alternative embodiment, the temperature acquisition unit shown in fig. 2 includes: a signal multiplexer U2 and a plurality of pull-up voltage dividing resistors; wherein the signal multiplexer U2 comprises 4 digital signal ports (S0, S1, S2,) And 1 analog signal output port temp_ad;
each NTC temperature sensor 40 is serially connected with a corresponding pull-up voltage dividing resistor for dividing voltage, and is electrically connected with the signal multiplexer U2 after dividing voltage;
the 4 digital signal ports of the signal multiplexer U2 are connected with the singlechip module 30 in parallel; the 1 analog signal output ports of the signal multiplexer U2 are electrically connected to the single chip module 30 independently.
Wherein 1 temperature acquisition unit 101 comprises 1 signal multiplexer U2, and signal multiplexer U2 comprises 4 digital signal ports S0, S1, S2,And 1 analog signal output port temp_ad.
Optionally, when 4 temperature acquisition units 101 may be included in each temperature acquisition module 10, the 4 temperature acquisition units 101 correspond to 4 signal multiplexers U2, each signal multiplexer U2 corresponds to 1 analog signal output port, and the 4 signal multiplexers U2 correspond to 4 analog signal output ports, which are respectively temp_ad1, temp_ad2, temp_ad3, and temp_ad4.
The 4 digital signal ports of each signal multiplexer U2 are electrically connected in parallel with the single-chip microcomputer module 30, and the 4 analog signal output ends of the 4 signal multiplexers U2 are respectively and independently electrically connected with the 4 ports of the single-chip microcomputer module 30.
In an alternative embodiment, each temperature acquisition unit 101 is connected to 8 NTC temperature sensors 40, and the temperature acquisition units 101 acquire the temperature values of the NTC temperature sensors 40 in a time-sharing manner through the signal multiplexer U2.
In an alternative embodiment, the single-chip module 30 controls the working state of the signal multiplexer U2 according to the 4 digital signal ports.
As shown in fig. 2, each temperature acquisition unit 101 includes 8 NTC temperature sensors 40, 8 pull-up voltage dividing resistors R1, R2, R3, R4, R5, R6, R7, and R8. Each temperature acquisition unit 101 is connected to 8 NTC temperature sensors 40, indicating that each temperature acquisition unit 101 can acquire temperature values of 8 NTC temperature sensors 40. Each NTC temperature sensor 40 is serially connected to a corresponding pull-up voltage dividing resistor for dividing voltage, and is electrically connected to the signal multiplexer U2 after dividing voltage. The singlechip module 30 controls the working state of the signal multiplexer U2 according to the 4 digital signal ports of the signal multiplexer U2, namely, controls the on-off states of Y0, Y1, Y2, Y3, Y4, Y5, Y6 and Y7 in fig. 2, and collects the temperature values of each NTC temperature sensor 40 in a time-sharing manner according to the working state of the signal multiplexer U2. For example, the singlechip module 30 controls Y0 to be closed according to the 4 digital signal ports of the signal multiplexer U2, and Y1, Y2, Y3, Y4, Y5, Y6, and Y7 are opened, so that the temperature value of the NTC temperature sensor 40 connected in series with R8 can be collected.
In an alternative embodiment, as shown in fig. 5, a block diagram of the voltage reference module 20 is shown, where the voltage reference module 20 includes a current limiting resistor, a voltage reference chip, and a second voltage follower; and an externally introduced 5V power supply is connected in series with the voltage reference chip through the current limiting resistor, and the rear stage of the voltage reference chip is connected with the second voltage follower so as to output a 4.096V power supply to supply power to other circuits. Only one voltage reference module 20 is connected with the MCU, the battery temperature acquisition circuit and the singlechip module 30 respectively, the voltage reference module 20 is equivalent to a voltage with high precision, a reference level is provided, the singlechip module 30 can acquire signals only by having the reference level, and the higher the precision of the reference level is, the higher the precision of the acquired signals is.
The voltage reference module 20 is a 4.096V power supply, and includes a current limiting resistor R10, a voltage reference chip Q1, and a second voltage follower. The second voltage follower includes a capacitor C1 and an operational amplifier U1A. The voltage reference chip Q1 is a high-precision voltage stabilizing source, the temperature drift is less than 50 ppm/DEGC, and the voltage precision error is less than or equal to +/-0.1%.
In the embodiment of the application, an externally-introduced 5V power supply is connected in series with a voltage reference chip Q1 through a current limiting resistor R10, and the voltage reference chip Q1 is connected with a voltage follower formed by an operational amplifier U1A at the later stage due to limited power, so that the driving capability is improved, and the operational amplifier U1A outputs a stable 4.096V power supply to supply power to other circuits. The 4.096V power supply is used for providing high-precision reference power for the singlechip module 30 and the temperature acquisition unit 101. Due to the wide collection range of the NTC temperature sensor 40, even a power error of 0.1V is manifested by a difference in temperature of 5 c or more. Therefore, the error of the reference power supply with high precision is only +/-0.1%, and the acquisition precision can be greatly improved.
In an alternative embodiment, the temperature acquisition unit 101 further includes: a first voltage follower; the first voltage follower is connected with the signal multiplexer U2.
In an alternative embodiment, each temperature acquisition unit 101 is connected in parallel with the voltage reference module 20, and each temperature acquisition unit 101 is also connected in parallel with the voltage reference module 20. The 4.096V power supply is used as a voltage dividing power supply and connected with one ends of a plurality of pull-up voltage dividing resistors, and the other end of each pull-up voltage dividing resistor is respectively connected with an NTC temperature sensor 40,4.096V power supply and used for providing high-precision voltage dividing power supply for the plurality of pull-up voltage dividing resistors. Wherein each NTC temperature sensor 40 corresponds to one acquisition channel; the voltage values obtained by dividing the pull-up voltage dividing resistor and the NTC temperature sensor 40 are introduced into 8 input pins of a signal multiplexer U2, the single chip microcomputer module 30 controls the signal multiplexer U2 to alternately gate a plurality of acquisition channels in a preset switching period, the acquired temperature values are input into the first voltage follower through the signal multiplexer U2, and the acquired temperature values are input into the single chip microcomputer module 30 after being isolated by the first voltage follower.
The first voltage follower comprises an operational amplifier U1B, a resistor R9 and a capacitor C47.
In the embodiment of the present application, as shown in fig. 3 and 4, the NTC temperature sensor 40 is introduced into the circuit by a wire harness, a 4.096V power supply is used as a voltage dividing power supply and is respectively connected with one end of 8 pull-up voltage dividing resistors R1, R2, R3, R4, R5, R6, R7 and R8, the other end of each pull-up voltage dividing resistor is respectively connected with one NTC temperature sensor 40, and each NTC temperature sensor 40 corresponds to one collecting channel. The first voltage follower is connected to the 3 rd pin (i.e. temp_ad in fig. 3) of the analog output port of the signal multiplexer U2, and the 6 th pin (EN 1), the 9 th pin (S2), the 10 th pin (S1), and the 11 th pin ((S0)) of the signal multiplexer U2 are connected to the singlechip module 30. The voltage value obtained by dividing the pull-up voltage dividing resistor and the NTC temperature sensor 40 is introduced into 8 input pins of the signal multiplexer U2, the single-chip microcomputer module 30 controls the signal multiplexer U2 to alternately gate 8 acquisition channels in a preset switching period (e.g., 0.5S), the 8 acquisition channels are output to the signal multiplexer U2 through a 3 rd pin, the 3 rd pin of the signal multiplexer U2 is electrically connected with a first voltage follower at a later stage, and the acquired temperature value is input to the single-chip microcomputer module 30 after being isolated by the first voltage follower.
In the embodiment of the application, the 4 temperature acquisition units 101 correspond to 4 signal multiplexers U2, and the 4 signal multiplexers U2 are connected with the singlechip module 30 in parallel. The singlechip module 30 is connected with the power supply through 4 digital signal ports S0, S1 and S2,（S0、S1、S2、The control buses of the temperature acquisition units 101 may be referred to as 1) to control the working state of the signal multiplexer U2 in the temperature acquisition units 101, and the 4 acquisition unit control buses are connected in parallel, that is, the singlechip module 30 sends control instructions to the 4 temperature acquisition units 101 at the same time, and each temperature acquisition unit 101 works at the same time and responds at the same time. Each temperature acquisition unit 101 has 1 analog signal output port for outputting and acquiring a temperature value, and 4 analog signal output ports temp_ad1, temp_ad2, temp_ad3 and temp_ad4 are respectively connected with 4 input pins of the single-chip microcomputer module 30, that is, the single-chip microcomputer module 30 can acquire 4 temperature values at the same time.
It should be noted that, when the ambient temperature changes, the resistance value of the NTC temperature sensor 40 (also referred to as the resistance value of the NTC thermistor) will change accordingly, the temperature rise resistance value becomes smaller, the temperature drop resistance value becomes larger, and the resistance values corresponding to different temperatures can be found accurately through the data manual. When the resistance value changes, the value of the voltage division of the related resistor also changes, and the singlechip module 30 calculates the ambient temperature of the NTC temperature sensor 40 through the collected voltage value.
For ease of understanding, it is illustrated herein that as the temperature increases, the resistance of the NTC thermistor decreases, which results in a decrease in the ratio of the divided voltage of the NTC thermistor in the resistor divider circuit, and a decrease in the voltage of the divided voltage signal. The operational amplifier amplifies the divided voltage signal and converts it into an analog voltage. The ADC then converts the analog voltage to a 12-bit digital value, and the digital value output from the ADC can be converted to a corresponding temperature using the temperature-resistance characteristic curve of the NTC thermistor.
In the embodiment of the application, according to the above description, one battery temperature acquisition circuit can acquire the temperatures of at most 32 single batteries, and according to different configurations of the vehicle battery cells, one trolley can be matched with a plurality of battery temperature acquisition circuits. Through the scheme, the singlechip module 30 can acquire 4 temperature values at the same time, and compared with a single-channel-controlled acquisition module, the single-channel-controlled acquisition module has high acquisition efficiency and occupies less MCU resources.
In one embodiment, a battery temperature acquisition product is provided that includes the battery temperature acquisition circuit described in each of the embodiments above. The product can be a battery temperature acquisition system, a vehicle (such as a trolley), an unmanned aerial vehicle and the like.
Fig. 6 is a schematic flow chart of a battery temperature acquisition method according to an embodiment. The method is applicable to a battery temperature acquisition circuit, and the battery temperature acquisition circuit comprises: the system comprises a temperature acquisition module, a voltage reference module and a singlechip module; the temperature acquisition module comprises a plurality of temperature acquisition units; the temperature acquisition unit includes: a signal multiplexer and a plurality of pull-up voltage dividing resistors;
the voltage reference module is respectively connected with the temperature acquisition module and the singlechip module; the temperature acquisition units are connected with the singlechip module in parallel; each temperature acquisition unit is connected with a plurality of NTC temperature sensors in the battery pack through a wire harness; one end of each pull-up voltage dividing resistor is connected with an NTC temperature sensor respectively, and each NTC temperature sensor corresponds to one acquisition channel;
the method comprises the following steps:
s601, introducing a voltage value obtained by voltage division of a pull-up voltage dividing resistor and an NTC temperature sensor into a signal multiplexer;
s602, controlling the signal multiplexer to alternately gate a plurality of acquisition channels through the singlechip module in a preset switching period, and inputting acquired temperature values into the singlechip module through the signal multiplexer.
For specific limitations on the battery temperature acquisition method, reference may be made to the above limitation on the battery temperature acquisition circuit, and no further description is given here.
It should be understood that, although the steps in the flowchart of fig. 7 are shown in sequence as indicated by the arrows, the steps are not necessarily performed in sequence as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in fig. 7 may include multiple sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, or the order in which the sub-steps or stages are performed is not necessarily sequential, but may be performed in rotation or alternatively with at least a portion of the sub-steps or stages of other steps or steps.
In one embodiment, a computer device is provided, which may be a server, the internal structure of which may be as shown in fig. 7. The computer device includes a processor, a memory, a network interface, and a database connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The database of the computer device is for storing data. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a battery temperature acquisition method.
It will be appreciated by those skilled in the art that the structure shown in FIG. 7 is merely a block diagram of some of the structures associated with the present inventive arrangements and is not limiting of the computer device to which the present inventive arrangements may be applied, and that a particular computer device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.
In one embodiment, a computer device is provided that includes a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the contents of the above embodiments when the computer program is executed.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in embodiments provided herein may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), memory bus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims (10)

1. A battery temperature acquisition circuit, characterized in that the battery temperature acquisition circuit comprises: the system comprises a temperature acquisition module, a voltage reference module and a singlechip module; the temperature acquisition module comprises a plurality of temperature acquisition units;
the voltage reference module is respectively connected with the temperature acquisition module and the singlechip module; the temperature acquisition units are connected with the singlechip module in parallel; each temperature acquisition unit is connected with a plurality of NTC temperature sensors inside the battery pack through a wire harness.
2. The battery temperature acquisition circuit according to claim 1, wherein the temperature acquisition unit includes: a signal multiplexer and a plurality of pull-up voltage dividing resistors; wherein the signal multiplexer comprises 4 digital signal ports and 1 analog signal output port;
each NTC temperature sensor is connected with a corresponding pull-up voltage dividing resistor in series for dividing voltage, and is electrically connected with the signal multiplexer after dividing voltage;
the 4 digital signal ports of the signal multiplexer are connected with the singlechip module in parallel; and 1 analog signal output ports of the signal multiplexer are independently and electrically connected with the singlechip module.
3. The battery temperature acquisition circuit according to claim 2, wherein the temperature acquisition unit includes: a first voltage follower; the first voltage follower is connected with the signal multiplexer.
4. A battery temperature acquisition circuit according to claim 3, wherein each temperature acquisition unit is connected to 8 NTC temperature sensors, and the temperature acquisition units acquire the temperature values of the NTC temperature sensors in a time-sharing manner through the signal multiplexer.
5. The battery temperature acquisition circuit of claim 4, wherein the single-chip microcomputer module controls the working state of the signal multiplexer according to the 4 digital signal ports.
6. The battery temperature acquisition circuit of claim 4, wherein the voltage reference module comprises a current limiting resistor, a voltage reference chip, and a second voltage follower; and an externally introduced 5V power supply is connected in series with the voltage reference chip through the current limiting resistor, and the rear stage of the voltage reference chip is connected with the second voltage follower so as to output a 4.096V power supply to supply power to other circuits.
7. The battery temperature acquisition circuit according to claim 6, wherein the 4.096V power supply is connected with one end of a plurality of pull-up voltage dividing resistors as a voltage dividing power supply, the other end of each pull-up voltage dividing resistor is respectively connected with an NTC temperature sensor, and each NTC temperature sensor corresponds to one acquisition channel; the method comprises the steps that voltage values obtained by voltage division of a pull-up voltage dividing resistor and an NTC temperature sensor are led into 8 input pins of a signal multiplexer, the signal multiplexer is controlled by a single chip microcomputer module to alternately gate a plurality of acquisition channels according to a preset switching period, the acquired temperature values are input into a first voltage follower through the signal multiplexer, and the acquired temperature values are input into the single chip microcomputer module after being isolated by the first voltage follower.
8. The battery temperature acquisition circuit of claim 1, wherein the battery temperature acquisition circuit comprises an NTC temperature sensor.
9. A battery temperature acquisition product, characterized in that the product comprises a battery temperature acquisition circuit according to any one of claims 1 to 8.
10. A battery temperature acquisition method, the method being suitable for a battery temperature acquisition circuit, the battery temperature acquisition circuit comprising: the system comprises a temperature acquisition module, a voltage reference module and a singlechip module; the temperature acquisition module comprises a plurality of temperature acquisition units; the temperature acquisition unit includes: a signal multiplexer and a plurality of pull-up voltage dividing resistors;
the voltage reference module is respectively connected with the temperature acquisition module and the singlechip module; the temperature acquisition units are connected with the singlechip module in parallel; each temperature acquisition unit is connected with a plurality of NTC temperature sensors in the battery pack through a wire harness; one end of each pull-up voltage dividing resistor is connected with an NTC temperature sensor respectively, and each NTC temperature sensor corresponds to one acquisition channel;
the method comprises the following steps:
introducing the voltage value obtained by dividing the voltage by the pull-up dividing resistor and the NTC temperature sensor into a signal multiplexer;
and controlling the signal multiplexer to alternately gate a plurality of acquisition channels through the singlechip module in a preset switching period, and inputting the acquired temperature value into the singlechip module through the signal multiplexer.
CN202310975032.2A 2023-08-04 2023-08-04 Battery temperature acquisition circuit, product and battery temperature acquisition method Active CN116698220B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310975032.2A CN116698220B (en) 2023-08-04 2023-08-04 Battery temperature acquisition circuit, product and battery temperature acquisition method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310975032.2A CN116698220B (en) 2023-08-04 2023-08-04 Battery temperature acquisition circuit, product and battery temperature acquisition method

Publications (2)

Publication Number Publication Date
CN116698220A true CN116698220A (en) 2023-09-05
CN116698220B CN116698220B (en) 2023-11-10

Family

ID=87829702

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310975032.2A Active CN116698220B (en) 2023-08-04 2023-08-04 Battery temperature acquisition circuit, product and battery temperature acquisition method

Country Status (1)

Country Link
CN (1) CN116698220B (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009109271A (en) * 2007-10-29 2009-05-21 Sanyo Electric Co Ltd Method of detecting temperature in power supply device
CN101750163A (en) * 2010-01-05 2010-06-23 杭州电子科技大学 Temperature humidity gauge based on MSP 430 singlechip
CN104007391A (en) * 2014-04-29 2014-08-27 江苏华东锂电技术研究院有限公司 Temperature and voltage monitoring system of lithium battery pack
CN106959160A (en) * 2017-05-16 2017-07-18 广东顺德工业设计研究院(广东顺德创新设计研究院) Faint optical signal processing unit and Feebleness Light Signal Examining system
CN110737299A (en) * 2019-10-10 2020-01-31 华东光电集成器件研究所 low-voltage variable constant current source device
CN115265646A (en) * 2022-07-05 2022-11-01 杭州高特电子设备股份有限公司 Multichannel voltage temperature set acquisition circuit
CN116225137A (en) * 2022-10-17 2023-06-06 中国电力科学研究院有限公司 Method and system for outputting high-precision direct-current voltage

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009109271A (en) * 2007-10-29 2009-05-21 Sanyo Electric Co Ltd Method of detecting temperature in power supply device
CN101750163A (en) * 2010-01-05 2010-06-23 杭州电子科技大学 Temperature humidity gauge based on MSP 430 singlechip
CN104007391A (en) * 2014-04-29 2014-08-27 江苏华东锂电技术研究院有限公司 Temperature and voltage monitoring system of lithium battery pack
CN106959160A (en) * 2017-05-16 2017-07-18 广东顺德工业设计研究院(广东顺德创新设计研究院) Faint optical signal processing unit and Feebleness Light Signal Examining system
CN110737299A (en) * 2019-10-10 2020-01-31 华东光电集成器件研究所 low-voltage variable constant current source device
CN115265646A (en) * 2022-07-05 2022-11-01 杭州高特电子设备股份有限公司 Multichannel voltage temperature set acquisition circuit
CN116225137A (en) * 2022-10-17 2023-06-06 中国电力科学研究院有限公司 Method and system for outputting high-precision direct-current voltage

Also Published As

Publication number Publication date
CN116698220B (en) 2023-11-10

Similar Documents

Publication Publication Date Title
Bryden et al. Methodology to determine the heat capacity of lithium-ion cells
US10093198B2 (en) Maintaining a vehicle battery
US10059222B2 (en) Battery temperature estimation system
Hijazi et al. Thermal network model of supercapacitors stack
US11374425B2 (en) Battery energy storage system, battery management system, and control method for controlling battery temperature
CN111144029B (en) Modeling method for thermoelectric coupling characteristics of lithium ion power battery
CN105070975A (en) Heat dissipation device and method for power battery pack
US20150030898A1 (en) Method and device for identifying an increase in temperature in a plurality of electrochemical storage cells
CN115214424A (en) Temperature determination method and device of battery thermal management system and electronic equipment
CN116698220B (en) Battery temperature acquisition circuit, product and battery temperature acquisition method
CN105470589A (en) Battery system, battery thermal management method and apparatus, and battery management unit
CN114929504A (en) Method for predicting an electrical load imposed on each battery cell in an electrical energy storage system
Lin et al. Temperature estimation in a battery string under frugal sensor allocation
CN114865726A (en) Control method of battery pack, battery management system and BMS chip
CN114008403A (en) Method for operating a heat exchanger and energy storage heat exchange system
KR101579564B1 (en) Heating system for a battery module and method of heating the battery module
CN103999282A (en) System and method for determining charging and discharging power levels for a battery pack
Deng et al. Investigation of power battery heat generation measurement method with insulated cotton
CN115139829B (en) Charging heating control method and device, electronic equipment and storage medium
Rizzello et al. Dynamic electro-thermal li-ion battery model for control algorithms
CN112730506B (en) Method and device for evaluating heat exchange performance of air preheater
Kleiner et al. Thermal behavior of intelligent automotive lithium-ion batteries: Experimental study with switchable cells and reconfigurable modules
Yan et al. Electrothermal characterization and modeling of lithium-ion pouch cells in thermal runaway
CN113748438A (en) Electric quantity prediction method and device
Kleiner et al. Experimental study on the thermal interactions in novel intelligent lithium-ion modules for electric vehicles

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant